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A new wrought alloy has been developed for use as furnace tubes in ethylene pyrolysis plants. This alloy has an excellent carburization resistance due to uniform formation of protective Al2O3 oxide scale on the metal surface. Laboratory corrosion tests have been carried out to evaluate carburization resistance of the developed alloy.
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Electrochemical corrosion rate probes have been constructed and tested along with mass loss coupons in an air plus water vapor and a N2/O2/CO2 plus water vapor environment. Temperatures ranged from 200º to 700ºC. Results show that electrochemical corrosion rates for ash-covered mild steel are a function of time, temperature and process environment.
Fusion Bonded Epoxy (FBE) is required to protect the pipes in higher temperatures. This paper reports evaluation methods for these high Tg FBE, and the performance differences between the high Tg FBE and general FBE.
Evaluation of corrosion inhibitors for high temperature (HT) upstream oilfield applications can be challenging. A series of laboratory testing methodologies were conducted to further elucidate the factors which affect laboratory corrosion inhibitor performance in high temperature conditions.
This paper explains the most common damage mechanisms of high temperature alloys in radiant section such as creep/carburization, thermal fatigue/carburization, and thermal shock.
Previous studies have shown that, from 80°C to 200°C in an H2S only environment, magnetite forms as an inner layer while iron sulfides are found in the outer layer. A descriptive model for the formation mechanisms of magnetite and iron sulfide at high temperature is presented.
The influence of sulfur as H2S-addition on the stability or degradation of tube materials and on the coke formation was studied. The investigated samples were alumina-forming- as well as chromia-forming alloys taken from conventional radiant tubes.
A sour gas plant was experiencing high corrosion and fouling in aggressive conditions (170 to 195°F, 170 psi pH2S, 280 psi pCO2) including the presence of elemental sulfur (0.1 wt%). The current chemical program appeared to be ineffective.
In this paper the charging procedure will be demonstrated. Two case histories will be shown including autoclave telemetry data (pressure and temperature) and pressure measurements taken at temperature.
Investigating the high temperature corrosion behavior of ferritic stainless steel UNS S43940 by cyclic exposure tests (CETs) at 650°C, in presence of NaCl and CaCl2 containing salt deposits and with different O2 and H2O concentrations.
In this paper, the corrosion performance of C110 tubing is investigated in high-density formate completion fluid at 180 oC with different combinations of CO2 mixed and mechanical damage.
Laboratory testing on two candidate completion brines…a buffered mixed formate and a proprietary bromide brine. Materials tested: super martensitic stainless, super duplex stainless, API 5CT/ ISO 11960 grade “C125” casing and nickel alloy.